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上一页下一页主菜单Tomislookingforhiskeytohisbike.Hecan’tfindit.Hehaslosthiskeytohisbike.现在完成时一.构成:have/has+done(过去分词)过去分词(pp)其变化方法和动词过去式基本相同。有部分不同，需要记好。HehaslivedinShenzhenfor4years.HashelivedinShenzhenfor4years?Yes,hehas./No,hehasn’t.现在完成时的主要用法上一页下一页--It’ssodark.--Someonehasturnedoffthelight.(有人刚把灯关了,对现在造成的结果是:现在很黑)--Areyoufree?--Ihavefinishedmyhomework.Iamfree(我已经完成了家庭作业,对现在造成的结果是很有空)主菜单1.表示过去发生的某一动作对现在造成的影响或结果。上一页下一页现在完成时的主要用法主菜单2.表示过去已经开始,持续到现在的动作或状态.常与since+过去的时间点，for+一段时间，sofar等时间状语连用。现在完成时的时间状语◆常与①already,②never,③ever,④just,⑤yet,⑥before,⑦uptonow,⑧sofar=untilnow⑨in/duringthelast/pastfewweeks⑩thesedays,(11)since+时间点,(12）for+时间段（13）ｒｅｃｅｎｔｌｙ（１４）ｉｎｈｉｓｌｉｆｅ（１５）ｌａｔｅｌｙalready:常用于肯定句中.•yet:常用于否定句,疑问句尾.连用上一页下一页主菜单A:______yourbrother_________anewwatch?(buy)B:Notyet.KeyKeywordswordsHasboughtyetA:_______youever_______tothepark?(be)B:Yes,Iwenttherelastsummer.KeyKeywordswordsHavebeenyeteverI______never______ofanythinglikethat.(hear)KeyKeywordswordshaveheardyeteverneverTom___________inthefactorysinceheleftschooltenyearsago.(work)KeyKeywordswordshasworkedyeteverneversinceA:Howlong______you________inthisschool?(teach)B:For6years.KeyKeywordswordshavetaughtyeteverneversinceforI______just________thedesk,youcantakeittoyourclassroom.(mend)KeyKeywordswordshavemendedyeteverneversinceforjust_______you_______theForbiddenCity(紫禁城)before?(visit)KeyKeywordswordsHavevisitedyeteverneversinceforjustbeforeHe____already______ajob.(find)KeyKeywordswordshasfoundyeteverneversinceforjustbeforealreadyWe_______only____________thefirstfivequestionssofar.(discuss)KeyKeywordswordshavediscussedyeteverneversinceforjustbeforealreadysofarThey______________over24,000fruittreesuptonow.(plant)KeyKeywordswordshaveplantedyeteverneversinceforjustbeforealreadysofaruptonowGreatchanges_________________inBeijinginthepast10years.(takeplace)KeyKeywordswordshavetakenplaceyeteverneversinceforjustbeforealreadysofaruptonowinthepast10yearsHe__________alotofgoodthingsinhislife.(do)KeyKeywordswordshasdoneyeteverneversinceforjustbeforealreadysofaruptonowinthepast10yearsinhislifeI____________herlately.(notsee)KeyKeywordswordshaven’tseenyeteverneversinceforjustbeforealreadysofaruptonowinthepast10yearsinhislifelatelyI_________________himrecently.(nothearfrom)KeyKeywordswordshaven’theardfromyeteverneversinceforjustbeforealreadysofaruptonowinthepast10yearsinhislifelatelyrecentlyHe___________inthiscityeversincethen.(live)KeyKeywordswordshaslivedyeteverneversinceforjustbeforealreadysofaruptonowinthepast10yearsinhislifelatelyrecentlyeversincethenHe___________inthishighschooltillnow.(teach)KeyKeywordswordshastaughtyeteverneversinceforjustbeforealreadysofaruptonowinthepast10yearsinhislifelatelyrecentlyeversincethentillnowsince:(自…以来)1)since+时间点Hehasstayedheresince5o’clock.2)since+时间段+agoHehasstayedheresince5hoursago.3)since+从句ShehastaughtEnglishsincehecamehere.for:(长达）for+时间段Hehaskeptthebookfor2weeks.since,for的用法:Takenotes瞬间动词和延续性动词若句中出现时间段，则必须使用延续性动词。瞬间动词和延续性动词转换关系如下begin/startbeongotherebet...